Voice over IP (VoIP) is a method of sending voice
signals over an INTERNET protocol (IP) based network. The
technology uses voice coder/decoder (codec) devices (DSPs or
application software) along with call processing algorithms running on
either embedded telecommunications systems or computers to convert
analog voice signals into IP based packets suitable for transmission
over the IP network or INTERNET. Calling functions are typically
managed by a protocol called SIP (Session Initiated Protocol) that
handles the routing and management of VoIP Calls. VoIP products
such as VoIP IP Telephones, VoIP IP PBXs and VoIP Gateways may use SIP
for call routing. VoIP IP Telephones typically have a telephone
instrument that connects to a network interface device or router
or IP access point instead of a telephone jack from the central
office. IP PBX equipment usually can connect both VoIP IP
Telephones and standard analog telephone instruments and even connect
to the central office using existing legacy telephone lines.
VoIP Gateways use higher density telephone lines called T1 or E1 and
convert them to VoIP for call placement over VoIP Networks.

VoIP IP PBX for end users,
SOHO, end office and small offices, small businesses, with FXS
ports for instruments, FXO ports for central office connection,
ISDN port option (in place of FXO) and IP ports for VoIP IP
Telephones. Includes advanced features such as
auto-attendant, voice mail, supplementary calling, call reroute,
etc.

VoIP Conference Server
for the active enterprise that wants control over business
conferencing, lowering costs and increased productivity.
Up to 25 member conference, multiple conferences, conference
selection features